// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/events/gestures/fling_curve.h"

#include "testing/gtest/include/gtest/gtest.h"

namespace ui {

TEST(FlingCurveTest, Basic)
{
    const gfx::Vector2dF velocity(0, 5000);
    base::TimeTicks now = base::TimeTicks::Now();
    FlingCurve curve(velocity, now);

    gfx::Vector2dF delta;
    EXPECT_TRUE(curve.ComputeScrollDeltaAtTime(
        now + base::TimeDelta::FromMilliseconds(20), &delta));
    EXPECT_EQ(0, delta.x());
    EXPECT_NEAR(delta.y(), 96, 1);

    EXPECT_TRUE(curve.ComputeScrollDeltaAtTime(
        now + base::TimeDelta::FromMilliseconds(250), &delta));
    EXPECT_EQ(0, delta.x());
    EXPECT_NEAR(delta.y(), 705, 1);

    EXPECT_FALSE(curve.ComputeScrollDeltaAtTime(
        now + base::TimeDelta::FromSeconds(10), &delta));
    EXPECT_EQ(0, delta.x());
    EXPECT_NEAR(delta.y(), 392, 1);

    EXPECT_FALSE(curve.ComputeScrollDeltaAtTime(
        now + base::TimeDelta::FromSeconds(20), &delta));
    EXPECT_TRUE(delta.IsZero());
}

} // namespace ui
